doc: Use RST, not Markdown format for links (backport #17311)

[mergify]

---

This is an automatic backport of pull request #17311 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 9397a51 has failed:

On branch mergify/bp/dev/10.2/pr-17311
Your branch is up to date with 'origin/dev/10.2'.

You are currently cherry-picking commit 9397a5144b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   doc/developer/topotests.rst

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[Jafaral]

need to do a manual backport fot this one.

[ton31337]

Nope, not need a backport at all, because that change was merged recently and wasn't backported.